build: rename ENABLE_FUZZ to BUILD_FOR_FUZZING

The name `ENABLE_FUZZ` is confusing because that option
does not enable fuzzing. `-DSANITIZERS=fuzzer` is what
enables fuzzing.

Fixes: bitcoin#30318

CMakeLists.txt

@@ -181,7 +181,7 @@ endif()
 
 option(BUILD_BENCH "Build bench_bitcoin executable." OFF)
 option(BUILD_FUZZ_BINARY "Build fuzz binary." OFF)
-cmake_dependent_option(ENABLE_FUZZ "Build for fuzzing. Enabling this will disable all other targets and override BUILD_FUZZ_BINARY." OFF "NOT MSVC" OFF)
+cmake_dependent_option(BUILD_FOR_FUZZING "Build for fuzzing. Enabling this will disable all other targets and override BUILD_FUZZ_BINARY." OFF "NOT MSVC" OFF)
 
 option(INSTALL_MAN "Install man pages." ON)
 
@@ -219,8 +219,8 @@ target_link_libraries(core_interface INTERFACE
   $<$<CONFIG:Debug>:core_interface_debug>
 )
 
-if(ENABLE_FUZZ)
-  message(WARNING "ENABLE_FUZZ=ON will disable all other targets and force BUILD_FUZZ_BINARY=ON.")
+if(BUILD_FOR_FUZZING)
+  message(WARNING "BUILD_FOR_FUZZING=ON will disable all other targets and force BUILD_FUZZ_BINARY=ON.")
   set(BUILD_DAEMON OFF)
   set(BUILD_CLI OFF)
   set(BUILD_TX OFF)

ci/test/00_setup_env_native_fuzz.sh

@@ -16,7 +16,7 @@ export RUN_FUZZ_TESTS=true
 export GOAL="install"
 export CI_CONTAINER_CAP="--cap-add SYS_PTRACE"  # If run with (ASan + LSan), the container needs access to ptrace (https://github.com/google/sanitizers/issues/764)
 export BITCOIN_CONFIG="\
- -DENABLE_FUZZ=ON \
+ -DBUILD_FOR_FUZZING=ON \
  -DSANITIZERS=fuzzer,address,undefined,float-divide-by-zero,integer \
  -DCMAKE_C_COMPILER=clang-18 \
  -DCMAKE_CXX_COMPILER=clang++-18 \

ci/test/00_setup_env_native_fuzz_with_msan.sh

@@ -19,7 +19,7 @@ export DEP_OPTS="DEBUG=1 NO_BDB=1 NO_QT=1 CC=clang CXX=clang++ CFLAGS='${MSAN_FL
 export GOAL="install"
 # _FORTIFY_SOURCE is not compatible with MSAN.
 export BITCOIN_CONFIG="\
- -DENABLE_FUZZ=ON \
+ -DBUILD_FOR_FUZZING=ON \
  -DSANITIZERS=fuzzer,memory \
  -DAPPEND_CPPFLAGS='-DBOOST_MULTI_INDEX_ENABLE_SAFE_MODE -U_FORTIFY_SOURCE' \
 "

ci/test/00_setup_env_native_fuzz_with_valgrind.sh

@@ -16,7 +16,7 @@ export RUN_FUZZ_TESTS=true
 export FUZZ_TESTS_CONFIG="--valgrind"
 export GOAL="install"
 export BITCOIN_CONFIG="\
- -DENABLE_FUZZ=ON \
+ -DBUILD_FOR_FUZZING=ON \
  -DSANITIZERS=fuzzer \
  -DCMAKE_C_COMPILER=clang-16 \
  -DCMAKE_CXX_COMPILER=clang++-16 \

doc/fuzzing.md

@@ -10,7 +10,7 @@ $ cd bitcoin/
 $ cmake -B build_fuzz \
    -DCMAKE_C_COMPILER="clang" \
    -DCMAKE_CXX_COMPILER="clang++" \
-   -DENABLE_FUZZ=ON \
+   -DBUILD_FOR_FUZZING=ON \
    -DSANITIZERS=undefined,address,fuzzer
 # macOS users: If you have problem with this step then make sure to read "macOS hints for
 # libFuzzer" on https://github.com/bitcoin/bitcoin/blob/master/doc/fuzzing.md#macos-hints-for-libfuzzer
@@ -148,7 +148,7 @@ Full configuration step that was tested on macOS with `brew` installed `llvm`:
 $ cmake -B build_fuzz \
    -DCMAKE_C_COMPILER="$(brew --prefix llvm)/bin/clang" \
    -DCMAKE_CXX_COMPILER="$(brew --prefix llvm)/bin/clang++" \
-   -DENABLE_FUZZ=ON \
+   -DBUILD_FOR_FUZZING=ON \
    -DSANITIZERS=undefined,address,fuzzer \
 ```
 
@@ -170,7 +170,7 @@ $ make -C AFLplusplus/ source-only
 $ cmake -B build_fuzz \
    -DCMAKE_C_COMPILER="$(pwd)/AFLplusplus/afl-clang-lto" \
    -DCMAKE_CXX_COMPILER="$(pwd)/AFLplusplus/afl-clang-lto++" \
-   -DENABLE_FUZZ=ON
+   -DBUILD_FOR_FUZZING=ON
 $ cmake --build build_fuzz -j$(nproc)
 # For macOS you may need to ignore x86 compilation checks when running "cmake --build". If so,
 # try compiling using: `AFL_NO_X86=1 cmake --build build_fuzz -j$(nproc)`
@@ -199,7 +199,7 @@ $ cd ..
 $ cmake -B build_fuzz \
    -DCMAKE_C_COMPILER="$(pwd)/honggfuzz/hfuzz_cc/hfuzz-clang" \
    -DCMAKE_CXX_COMPILER="$(pwd)/honggfuzz/hfuzz_cc/hfuzz-clang++" \
-   -DENABLE_FUZZ=ON \
+   -DBUILD_FOR_FUZZING=ON \
    -DSANITIZERS=address,undefined
 $ cmake --build build_fuzz -j$(nproc)
 $ mkdir -p inputs/
@@ -319,7 +319,7 @@ $ cd Eclipser
 $ git checkout v1.x
 $ make
 $ cd ..
-$ cmake -B build_fuzz -DENABLE_FUZZ=ON
+$ cmake -B build_fuzz -DBUILD_FOR_FUZZING=ON
 $ mkdir -p outputs/
 $ FUZZ=bech32 dotnet ./Eclipser/build/Eclipser.dll fuzz -p build_fuzz/src/test/fuzz/fuzz -t 36000 -o outputs --src stdin
 ```